When magnesium is burned, it reacts with oxygen in air not with the fire. The fire is the energy needed for the reaction to happen. Magnesium reacts with oxygen forming magnesium oxide. The light emitted from the reaction is because the reaction produced a lot of heat.
Answer:
Histone proteins.
Explanation:
Histones are known as the special type of proteins which are +ve charged and low molecular in weight. They are highly basic proteins and containing basic amino acids such as arginine and lysine. Histones are +ve charged proteins and DNA is -ve charged in nature, due to the presence of phosphate groups in DNA backbone, histones bind with DNA very tightly and form a complex known as Nucleosome.
The Nucleosome is known as the fundamental unit of DNA packaging which is composed of an Octameric core of histone proteins (two each of histones H2A, H2B, H3, and H4) around which the double helix of DNA is wrapped.
Answer:
The answer to your question is 47.44 g of Oxygen
Explanation:
Data
mass of Ammonia = 14.4 g
mass of Oxygen = ?
Balanced chemical reaction
4NH₃ + 7O₂ ⇒ 4NO₂ + 6H₂O
Process
1.- Calculate the molar mass of Ammonia
NH₃ = 4[(1 x 14) + (3 x 1)] = 4[14 + 3] = 4[17] = 68 g
2.- Calculate the molar mass of Oxygen
O₂ = 7[16 x 2] = 7[32] = 224 g
3.- Use proportions to calculate the mass of Oxygen
68g of NH₃ --------------------- 224 g of O₂
14.4 g of NH₃ ----------------- x
x = (14.4 x 224) / 68
x = 3225.6/ 68
x = 47.44 g
D. In a Chemical reaction, elements are not changed, just rearranged. Small amounts of energy take place.
The correct answer is option B, that is, the respiratory and circulatory systems.
The respiratory and circulatory system functions together to circulate oxygen and blood all through the body. The movement of air takes place in and out of the lungs via the bronchi, trachea, and bronchioles. The movement of blood takes place in and out of the lungs via the pulmonary veins and arteries, which associate with the heart.
The pulmonary arteries mediate deoxygenated blood to the lungs from the heart, and the pulmonary veins carry oxygenated blood to the heart again so that it can be distributed to the rest of the body.
